BOSTON (AP) — Massachusetts State Police say high school students and their adult chaperones were on a charter bus after a visit to Harvard University when the oversized bus crashed into a bridge in Boston.

The bus crashed about 7:30 p.m. Saturday as it was passing under a bridge on Soldier’s Field Road, a major crosstown road. The Destined for a Dream Foundation group was returning to the Philadelphia area.

The injured, three seriously, were taken to hospitals.

Authorities say the bus did not belong on that road and state police are investigating whether charges are warranted against the driver after apparently failing to see the sign prohibiting the vehicle from taking that route. Bus owner Raymond Talmedge said his driver was being interviewed by police. Talmedge said he had no other information.